2 Function It’s main function is Transportation Blood is used as a transport vehicletransports oxygen, nutrients, cell waste (such as Carbon dioxide), hormones and antibodies vital to maintaining homeostasis to and from cells
3 Parts of the Circulatory System Divided into three major parts:The HeartThe Blood VesselsThe Blood
4 The Major Organ-The Heart Heart acts as pumpThe heart pumps beats per minute (at rest)At REST, the heart pumps about 5 QUARTS of blood a minute.During EXTREME EXERTION (exercise) it can pump 40 quarts a minute.
5 Structure Size of your fist Large organ composed of cardiac muscle--called myocardiumEnclosed by a sac –called PERICARDIUMrich in mitochondria4 hollow chambersContain valves to keep blood flowing in ONE direction
6 The pathway looks like a circle The heart, the lungs, and the blood vessels work together to form the circle part of the circulatory system.
7 The Chambers The heart has 4 hollow chambers Upper chambers – atrium receives blood coming in from the veinsLeft & right AtriumLower chambers - ventricle squeezes blood out into the arteriesLeft & right ventricle
9 Double PumpThe two ventricles are responsible for the pumping action of the heartEach chamber pumps blood out of the heart but to different pathwaysThat is why the heart is considered to be a double pump
11 Pulmonary Circulation Movement of blood from the heart, to the lungs, and back to the heart again
12 Pulmonary Circulation Pathway 1. The right Atria receives oxygen poor blood from the body.2. blood moves to the right ventricle where it is pumped out to the lungs via pulmonary arteries3. O₂ is exchanged for CO₂4. Oxygen rich blood now leaves lungs and returns to the heart
14 THIS IS THE LARGEST PATHWAY OF THE CIRCULATORY SYSTEM! Systemic CirculationSupplies nourishment to all of the tissue located throughout the body , except for the heart and lungsTHIS IS THE LARGEST PATHWAY OF THE CIRCULATORY SYSTEM!
15 Systemic Circulation Pathway Oxygen rich blood returning from the lungs now enters the left atriumMoves through the valves to the left ventricleThe left ventricle pumps the oxygen rich blood out the AortaThe blood is then carried from aorta to blood vessels delivering oxygen and nutrients to ALL tissues of the bodyBlood returns (oxygen poor) back to right atria
20 Hollow tubes that circulate your blood Blood VesselsHollow tubes that circulate your bloodArteriesVeinsCapillaries
21 Arteries Carry blood AWAY from the heart Heart pumps blood Main artery called the aortaAorta divides and branchesMany smaller arteriesEach region of your body has system of arteries supplying it with fresh, oxygen-rich blood.
22 Capillaries Very thin Only one cell thick Connect arteries & veins Food and oxygen released to the body cellsCarbon dioxide and other waste products returned to the bloodstream
23 Veins Carry blood to the heart Receive blood from the capillaries Transport waste-rich/ oxygen-poor blood back to the lungs and heartValves are located inside the veinsAllow blood to move in one direction
28 BloodCarries nutrients, water, oxygen and waste products to and from your body cells.Hemoglobin, iron containing moleculeLoosely picks up oxygen in the lungsLoses oxygen in areas low in oxygen (diffuses)
29 Blood Hemoglobin carries CO2 also CO2 is a waste product of cellular work70% of CO2 combines with waterThe rest travels to the lungs
30 Blood – RBCsRed blood cells carry oxygen from the lungs to all the cells of the body.Takes carbon dioxide and transports it back to the lungsAbout 5,000,000 Red Blood Cells in ONE drop of blood.
34 Blood – Platelets and Plasma Platelets are blood cells that help stop bleedingPlasma is the liquid part of the bloodAbout half of your blood is made of plasmaThe plasma carries the blood cells throughout the bodyPlasma is made in the liver.
36 SUMMARYcopy and complete the following;Arteries take blood ______ from the heart. The walls of an artery are made up of thick _________ walls and elastic fibres. Veins carry blood ________ the heart and also have valves. The _________ link arteries and veins, and have a one cell thick wall. Blood is made up of four main things ______, the liquid part of the blood; Red Blood Cells to carry ______; White Blood cells to protect the body from disease and _________ to help blood clot.awaymusculartowardscapillariesplasmaoxygenplatelets
37 Some Disorders and Diseases of the Circulatory System
38 DISORDERS ATHEROSCLEROSIS Fatty deposits called plaque Builds up in walls of arteriesObstructs flowAlso a risk if clot breaks free and blocks flow elsewhere
39 Disorders (cont) Hypertension High blood pressure Hearts works harder than necessaryIncreases risk of heart attack or stroke
40 Disorders (cont) Heart Attack Atherosclerosis in coronary artery Heart muscle begins to dieSymptomsNauseaShortness of breathSevere chest painIMMEDIATE MEDICAL ATTENTION NECESSARY
41 Disorders (cont) Stroke Blood clot gets stuck in blood vessels leading to brainBrain cells die due to lack of oxygenOr blood vessel burstCan lead to paralysis,loss of ability to speakdeath